"It is much easier for me to imagine a praying murderer, a praying prostitute, than a vain person praying. Nothing is so at odds with prayer as vanity."

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But, say you, surely there is nothing easier than for me to imagine trees, for instance, in a park [. . .] and nobody by to perceive them. [...] The objects of sense exist only when they are perceived; the trees therefore are in the garden [. . .] no longer than while there is somebody by to perceive them.

— George Berkeley